R help - Jul 2010 - Using" fig=" in one screen created with "split.screen()"

Hi,

I successfully created 3 screens with the following:

fig.mat<-c(0,.5,.5,.5,1,1,0,0,.5,1,.5,1)
fig.mat<-matrix(fig.mat,nrow=3)
fig.mat
split.screen(fig.mat)

I can plot three different plots on those 3 screens, but when I try the
following:
(Trying to create three graphs with a common x-axis but different y-axis on
screen 1)

screen(1)
par(oma=c(3,3,0,0))
par(fig=c(0,1,0,0.33))
par(mar=c(0,2,0,0.2))
plot(x,y,ylab="juveniles",type="b")
par(fig=c(0,1,0.33,0.66),new=T)
par(mar=c(0,2,0,0.2))
plot(x,y,ylab="males",type="l",xaxt="n")
par(fig=c(0,1,0.66,0.99),new=T)
par(mar=c(0,2,0.2,0.2))
plot(x,y,ylab="females",type="p",xaxt="n")
title(xlab="class",ylab="frequency",outer=T)

Screen 1 seems to expand over the whole plotting device instead of being
restricted to only the region appointed to Screen 1.

Changing "fig=c(0,1,0,0.33)" to " fig=c(0,0.5,0,0.33)" gives
me the result I was looking for. Why do I have to use "fig" in respect
to the original plotting device and not in respect to the new one (screen1) ?

I thought the use of split.screen() gives the advantage of having three regions
that are treated as separate plotting devices, so that my original code should
work. But I guess that I got it wrong ?!?

Thanks for explanations!

/Birte

	[[alternative HTML version deleted]]

Hi

split.screen() works by maintaining a set of par(fig) settings, so that 
a call to screen() is essentially a call to par(fig=<something>). 
Hence, an explicit par(fig=<somethingelse>) call mucks up the plot 
arrangement made by screen().

Are you trying to use par(fig) to split up a split.screen() screen into 
even smaller pieces?  If so, you should be able to do that using 
split.screen() (see the examples at the bottom of the help page).

Alternatively, you may be able to create the complete plot arrangement 
using layout().

Paul

On 21/07/2010 12:14 a.m., Birte Reichstein wrote:
> Hi,
>
> I successfully created 3 screens with the following:
>
> fig.mat<-c(0,.5,.5,.5,1,1,0,0,.5,1,.5,1)
> fig.mat<-matrix(fig.mat,nrow=3)
> fig.mat
> split.screen(fig.mat)
>
> I can plot three different plots on those 3 screens, but when I try the
following:
> (Trying to create three graphs with a common x-axis but different y-axis on
screen 1)
>
> screen(1)
> par(oma=c(3,3,0,0))
> par(fig=c(0,1,0,0.33))
> par(mar=c(0,2,0,0.2))
> plot(x,y,ylab="juveniles",type="b")
> par(fig=c(0,1,0.33,0.66),new=T)
> par(mar=c(0,2,0,0.2))
> plot(x,y,ylab="males",type="l",xaxt="n")
> par(fig=c(0,1,0.66,0.99),new=T)
> par(mar=c(0,2,0.2,0.2))
> plot(x,y,ylab="females",type="p",xaxt="n")
> title(xlab="class",ylab="frequency",outer=T)
>
> Screen 1 seems to expand over the whole plotting device instead of being
restricted to only the region appointed to Screen 1.
>
> Changing "fig=c(0,1,0,0.33)" to " fig=c(0,0.5,0,0.33)"
gives me the result I was looking for. Why do I have to use "fig" in
respect to the original plotting device and not in respect to the new one
(screen1) ?
>
> I thought the use of split.screen() gives the advantage of having three
regions that are treated as separate plotting devices, so that my original code
should work. But I guess that I got it wrong ?!?
>
> Thanks for explanations!
>
> /Birte
>
> 	[[alternative HTML version deleted]]
>
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-- 
Dr Paul Murrell
Department of Statistics
The University of Auckland
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